Add project files.

src/modules/Elsa.Sql.SqlServer/Elsa.Sql.SqlServer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <Description>
+      Provides client implementations for interacting with Microsoft SQL Server databases.
+    </Description>
+    <PackageTags>elsa module activities sql mssqlserver sqlserver</PackageTags>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Data.SqlClient" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Elsa.Sql\Elsa.Sql.csproj" />
+  </ItemGroup>
+
+</Project>

src/modules/Elsa.Sql.SqlServer/FodyWeavers.xml

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+<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
+  <ConfigureAwait />
+</Weavers>

src/modules/Elsa.Sql.SqlServer/SqlServerClient.cs

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+using System.Data.Common;
+using Elsa.Sql.Client;
+using Microsoft.Data.SqlClient;
+
+namespace Elsa.Sql.SqlServer;
+
+/// <summary>
+/// Microsoft SQL server client implementation.
+/// </summary>
+/// <param name="connectionString"></param>
+public class SqlServerClient(string connectionString) : BaseSqlClient(connectionString)
+{
+    protected override DbConnection CreateConnection() => new SqlConnection(_connectionString);
+
+    protected override DbCommand CreateCommand(string query, DbConnection connection) => new SqlCommand(query, (SqlConnection)connection);
+}